When completed, this study will be one of the largest in the US to study risk factors for osteoporosis in men, historically an understudied group in relation to osteoporosis. Several of the hypothesized risk factors (smoking, alcohol, caffeine, for example) are amenable to change and represent potential areas of intervention. Thus, not only can the VA make a valuable contribution to furthering our understanding of osteoporosis in men in general, but strategies may be identified to reduce morbidity as well as reduce health care costs associated with fracture in the elderly.